'Created by' vs 'App Created by' columns - Sharepoint Lists

Hi All,

Can someone please explain the difference between these two columns in sharepoint lists? I have a list of almost 2000 items; the 'Created by' are all people's names, as I would expect, while the majority of 'App Created by' columns are blank. The other values here are Microsoft Power Platform (5 items), and OneDrive SyncEngine (30 items). I have not been able to discover any MS documentation about how/when this is populated.

I am assuming that Microsoft Power Platform means it was created via a Power App or Power Automate Flow - any way of discovering which, and if a flow, which flow?

OneDrive SyncEngine I have no idea at all and would appreciate knowing for my own interest.

Discovery of this has come about by realising we had 5 blank rows in the List - causing Power BI report refresh to fail - as these appeared to be 'duplicates' with no values in the Title column. These 5 rows were all 'App Created by' Microsoft Power Platform or OneDrive Sync Engine.

Sharepoint version is 'Sharepoint in Microsoft 365' formerly known as Sharepoint Online

Thanks in advance for any help!